ENOfficial
Ibn ‘Abbas said that Mu'awiya told him he had clipped some hair from the Prophet’s head at al-Marwa with a broad, iron arrowhead. Bukhari and Muslim.
Source: sunnah.com
Other translations
Arabic
وَعَنِ ابْنِ عَبَّاسٍ قَالَ: قَالَ لِي مُعَاوِيَةُ: إِنِّي قَصَّرْتُ مِنْ رَأْسِ النَّبِيِّ صلى الله عَلَيْهِ وَسلم عِنْد الْمَرْوَة بمشقص
sunnah.com